| 引用本文: | 凌松,杨盛林,刘晓薇,袁震,杨波,商倩南,钟天阳,马璐璐,张玲.生态补水型城市河湖湿地系统溶解性有机质来源解析及其与水质关联性.湖泊科学,2024,36(6):1795-1805. DOI:10.18307/2024.0626 |
| Ling Song,Yang Shenglin,Liu Xiaowei,Yuan Zhen,Yang Bo,Shang Qiannan,Zhong Tianyang,Ma Lulu,Zhang Ling.Sources analysis of dissolved organic matter and their correlation with water quality in ecological replenishment urban river-lake wetland systems. J. Lake Sci.2024,36(6):1795-1805. DOI:10.18307/2024.0626 |
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| 生态补水型城市河湖湿地系统溶解性有机质来源解析及其与水质关联性 |
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凌松1, 杨盛林2,3, 刘晓薇1,4, 袁震2, 杨波1, 商倩南1, 钟天阳1, 马璐璐1, 张玲1
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1.合肥大学生物食品与环境学院, 合肥 230601;2.中国环境科学研究院, 湖泊水污染治理与生态修复技术国家工程实验室, 北京 100012;3.北京师范大学水科学研究院, 北京 100875;4.巢湖流域治理与高质量发展安徽省哲学社会科学重点实验室, 合肥 230601
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| 摘要: |
| 为探究补水型城市河湖人工湿地系统枯水期和丰水期溶解性有机质(DOM)的组成特征、来源及其与水质的关联性,以巢湖流域典型城市人工河湖湿地为研究对象,运用三维荧光光谱(EEMs)技术,结合平行因子分析法(PARAFAC)解析枯-丰水期湿地内水体DOM浓度组分变化和主要来源;分析常规水质指标pH、溶解氧、总磷(TP)、总氮、叶绿素a(Chl.a)和浊度的时空变化特征以及与DOM的关联性。结果表明:(1)通过PARAFAC识别出4种荧光组分,分别为紫外类富里酸C1、类色氨酸C2、类胡敏酸C3、类酪氨酸及可溶性微生物降解产物C4,丰水期DOM荧光强度高于枯水期,水体DOM受内源和陆源的双重影响,以自生源为主;(2)受城市地表径流及夏季巢湖蓝藻暴发的影响,各水质指标浓度的时空变化特征主要表现为丰水期高于枯水期、从上游到下游呈现先升高后下降的趋势,枯水期时的生态补水和方兴湖湿地能够对水质具有改善作用;(3)水质理化指标、DOM组分和荧光指数相关性分析结果表明,溶解性有机碳与Chl.a、浊度和C4组分呈显著正相关,TP与C1、C2和C3组分呈显著正相关,可见地表径流携带的有机污染物贡献了湿地中一部分DOM,浮游植物的内源产生是塘西河下游有机碳的重要来源。研究揭示了塘西河-方兴湖湿地DOM的荧光特征、组分来源、水期差异以及水质变化,为进一步探明城市河湖湿地生态系统DOM时空分布特性和来源以及生态补水对水质的影响等提供了基础资料。 |
| 关键词: 溶解性有机质 人工湿地 光谱特征 巢湖 |
| DOI：10.18307/2024.0626 |
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| 基金项目:巢湖生物资源调查研究项目(2020-340181-77-01-037328)、安徽省自然科学基金优秀青年项目(2308085Y38)和安徽高校协同创新项目(GXXT-2023-081)联合资助。 |
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| Sources analysis of dissolved organic matter and their correlation with water quality in ecological replenishment urban river-lake wetland systems |
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Ling Song1, Yang Shenglin2,3, Liu Xiaowei1,4, Yuan Zhen2, Yang Bo1, Shang Qiannan1, Zhong Tianyang1, Ma Lulu1, Zhang Ling1
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1.School of Biology, Food and Environment, Hefei University, Hefei 230601, P. R. China;2.National Engineering Laboratory for Lake Pollution Control and Ecological Restoration, Chinese Research Academy of Environmental Sciences, Beijing 100012, P. R. China;3.College of Water Science, Beijing Normal University, Beijing 100875, P. R. China;4.Management and High-quality Development for Chaohu Lake Basin, Anhui Key Laboratory of Philosophy and Social Sciences, Hefei 230601, P. R. China
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| Abstract: |
| In order to explore the compositional characteristics, sources, and correlation with water quality of dissolved organic matter(DOM) in urban river and lake artificial wetland systems replenished with ecological flow, a typical urban artificial river and lake wetland in Chaohu Basin was used as a study case. Three-dimensional fluorescence spectroscopy(EEMs) technology combined with parallel factor analysis(PARAFAC) was used to analyze the changes in the content and main sources of DOM in the water body of wetlands during dry and wet seasons. The spatiotemporal variation characteristics of conventional water quality indicators including pH, dissolved oxygen, total phosphorus(TP), total nitrogen(TN), chlorophyll-a(Chl.a), and turbidity were analyzed, as well as their correlations with DOM. The results indicated that: (1) PARAFAC recognized four fluorescent components, which were UV rich C1, tryptophan C2, humic acid C3, and tyrosine-like acids and soluble microbial degradation products C4. The fluorescence intensity of DOM in the wet season was higher than that in the dry season, and the DOM in the water was influenced by both endogenous and terrestrial sources, of which endogenous sources were the main source. (2) Due to the influence of urban surface runoff and the blue algae bloom in Lake Chaohu in summer, the spatiotemporal variation characteristics of these water quality indicators were mainly higher in the wet season than those in the dry season, and their concentrations showed increased at upstream and then decreased at downstream. Ecological flow replenishment during the dry season and the wetland can play a role on the improvement of water quality. (3) The correlation analysis of water quality physicochemical indicators, DOM components, and fluorescence index showed that dissolved organic carbon was significantly positively correlated with Chl.a, turbidity, and C4 components, and TP was significantly positively correlated with C1, C2, and C3. It suggested be seen that terrestrial sources such as surface runoff had an impact on DOM, and the endogenous production of phytoplankton was an important source of organic carbon in the downstream of Tangxi River. The study revealed the fluorescence characteristics, component sources, water period differences, and water quality changes of DOM in Tangxihe-Fangxinghu wetland, providing basic data for further exploring the spatiotemporal distribution characteristics and sources of DOM in urban river lake wetland ecosystems, as well as the impact of ecological flow replenishment on water quality. |
| Key words: Dissolved organic matter(DOM) artificial wetlands spectral characteristics Lake Chaohu |
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